From Pumpsolutions

Seal

...Viton Carbon/Ceramic - 1 1/2" - Type 21

The Viton Carbon/Ceramic Seal is a rubber seal that is resistant to most oils, acids and chemicals. The ceramicseat is relatively hard material and can withstand mild abrasives. Silican Carbide should be used for servere abrasive applications. Contact factory for liquid compatibility with viton. Max Temperature 240 deg F.

For use with Scot Pumps 1.5 - 15 HP at 3500 RPM; JM Frame
MODEL #'s

15 16 17 18 19; 19G; 19GN 25 27

For use with Scot Pumps 1/4 - 3/4 HP at 1750 RPM; C56 Frame
MODEL #'s

15 16 17 18 19 25 50 52 54 & 54F

For use with Scot Pumps 1 - 1.5 HPat 1750 RPM; JM Frame
MODEL #'s

15 17 18 25

For use with Scot Pumps 2 - 15 HP at 3500 RPM; JM Frame
MODEL #'s

50 52 53 & 53F 54 & 54F 55 & 55F 56 & 56F

For use with Scot Pumps 1 - 5 HP at 1750 RPM; JM Frame
MODEL #'s

52 54 & 54F 55 & 55F 56 & 56F 62.....1.5 - 5Hp at 1750 RPM; JM Frame

For use with Scot Pumps 2 - 10 HP at 1750 RPM; JM Frame
MODEL #'s

57 & 57E 58 59

For use with Scot Pumps 2 - 5 HP at 1750 RPM; JP Frame
MODEL #'s

102 103